Offset mechanism for printing-machines.



O. ROESEN. OFFSET MECHANISM FOR PRINTING MACHINES.

APPLICATION FILED JAN.15, 1909.

Patented Oct. 22, 1912.

3 SHEETS-SHEET 1.

0. ROESEN.

OFFSET MECHANISM FOR PRINTING MACHINES.

APPLICATION FILED JAN.15, 1909.

Patented Oct. 22, 1912.

3 SHEETS-SHEET 2.

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COLUMBIA PLANOGRAPH muwAsmrm'roN. D. :4

, O. ROESEN.

OFFSET MECHANISM FOR PRINTING MACHINES.

APPLICATION FILED JAN.15, 1909. 1,041,875.

W/TNESSES. //VVENTOR.

fig 7 My OSCAR ROEfiEN, 0F NEXV YGRK, N. Y., ASSIGNOR, BY MES-NEASSIGNMENTS, TO B. HOE AND (30., OF NEW YORK, N. Y., A CORPORATION OFNEW YORK.

OFFSET MECHANISM FOR PRINTING-MACHINES.

wlbom it may concern:

Be itknown that 1, Oscar Ronsnn, a citi Zen of the United States,residing at New York, county of New York, and State of )Tew York. haveinvented certain new and useful Improvements in Offset Mechanism forPrinting-Machines, fully described and represented in the followingspecification and the accompanying drawings, forming a part of the same.

T his invention relates to certain improvements in offset mechanism forprinting inachines.

In perfecting the sheets or webs if the previously printed side of thesheet or web is permitted to come directly in contact with covering orblanket of the impression cylinder the ink, if not dry, is liable to setelf upon the blanket so that the succeeding port ions of the webs or thesucceeding sheets will be defaced or smudged by the ink thus set off enthe blanket.

Various expedients have been employed to prevent offsets, a commonconstruction being an offset web which travels between the perfectingmember of the couple and its corresponding impression member, thisoffset web being unwound from one spindle and rewound upon anotherspindle. In thus using an offset web, after the first spindle has beenemptied and the second spindle filled, it is customary to shift theposition of the spindles and the web led again between the couples, thespindle from which itwas first unwound now serving as a rewindingspindle, and the other as the delivery spindle. in such constructions,however, the web is reversed as the position of the spindles is changedso that the side of the web which was next the freshly printed matterduring one passage of the web bet-ween the members of the printingcouple is next the impression cylinder on the succeeding passage of theweb between the members of the printing couple. If, however, the inkwhich has been taken up by the offset web is notperfectly dry it isliable, when the web is thus reversed, to set off on the blanket, andwhere repeated set offs occur in the same place the surface of theimpression member becomes slightly raised, thus producing a defect inthe printing, known as false impression Specification of Letters Patent.

Application filed January 15, 1909.

Patented (Pct. 22,1h12. Serial No. 472,416.

One of the objects of the invention is to provide an improved offsetmechanism employing an offset web which is to be repeatedly passedbetween the members of a printing couple, the construction being suchthat the side of the web which was next the impression member on onepassage of the web be tween the members of the printing couple shall benext the impression cylinder on the succeeding passage.

A further object of the invention is to provide an improved mechanismemploying an offset web and unwinding and rewinding saindles in whichthe position of the spindles may be readily shifted for succeedingpassages of the web between the members of the impression couple.

A further object of the invention is to produce an offset mechanismemploying a web for winding and rewinding the spindles by which theposition of the spindles may be readily and easily shifted forsucceeding passages of the web between the impression members of thecouple, the mechanism including improved driving and ten sionmechanisms.

\Vith this and other objects not specifically referred to in view, theinvention consists in certain constructions, and in certain parts,improvements and combinations as will be hereinafter described and thenspecifically pointed out.

Referring to the drawings :F igure 1 illustrates in side elevation oneembodiment of the invention. Fig. 2 is a plan View of the constructionillustrated in Fig. 1, the offset web shown in that figure being,however, omitted. Fig. 3, is a sectional elevation of the constructionillustrating certain features not illustrated in Fig. 1. Figs. 4: and 5are detail views illustrating certain forms of mechanism which may be employed.

Referring to the drawings, a rotary printing couple, the printingcylinder of which is marked 1, and the impression cylinder of which ismarked 2, is diagrammatically illustrated, said couple serving toperfect a web, indicated at 3. While a rotary printing couple isillustrated, it is to be understood that the invention is not confinedto the use of such couples, nor to couples which print upon a Web.

The construction embodying the invention will include an offset web,such web being shown in the drawings, and marked -jt.

In the constructions embodying the invention in its best form there willbe employed in connection with this offset web two spin dles, those inthe machine illustrated being marked respectively 5 and (5, each ofthese spindles serving in turn as a receiving; and delivery spindle.hieehanisi'n should be provided for drivingthese spindles when they arein receiving position. This mechanism may vary widely in itsconstruction, but in machines which embody the invention in its bestform, a driving mechanism will be provided for each spindle. ln theparticular machine shown, the driving mechanism for the spindle includesa pair of cradle rolls, 7, 3 and the driving mechanism for the spindle 6includes a Sll'lllltll'. pair of cradle rolls 5), 10. These cradle rollswhen employed may be driven in any suitable manner. In the constructionshown, the rolls 9, 10 are provided with gears 11, 12, these gears beingdriven by a gear 13. driven by similar gears, these gears being; markedIt, 15 see Fig. 2), these gears being in turn driven by a gear 16.

Means will be provided for shifting the spindles so that they maysuccessively occupy receiving and delivery positions. ll hile thesemeans may vary widely. in the best constructions they will be soarranged as to turn the spindles end for end as they are shifted fromone position to the other. In the particular machine shown, the shiftingmeans comprises a turn table 17, this table being mounted on a pivot 18suitably supported in the frame. if desired, in order to reduce thefriction, balls 19 may be employed on which the table rests, these ballsbeing supported in a suitable ball-way in the frame. In the particularmachine illustrated. the cradle rolls which, as has been indicated, forma part of the driving mechanism for the spindles, are mounted in ti oturn table and, therefore, move with it.

A suitaltile driver will be provided for the driving mechanism wierebythe driving mechanism is operated when the spindles are in receivingposition. T his driver may conof a gear 20, this gear being shown indotted lines in Figs. 1 and 3. This gear 20, when employed, may bedriven in any suitable manner, as for instance, by a train of gearsleadiu from the impression cylinder as indicated in dotted lines in Fig.1.

For convenience in enabling the gears 13 and l to be lJI'OllQlli'.readily into mesh with the driver 20, they may he movably mounted onstuds. one of which is shown at 21, in Fig. 2, these studs projectingfrom the frame. The gears 16 .may be mo "ably mounted on the studs inany suitable manner, as by providing the hub of the gear The rolls 7, 8may be be pulled oil tl with set screws 22 which lock the gears to thestuds. The studs may, if desired, be provided with large heads 22-3 toprevent the gears from coming off.

lilachines embodying the invention in its best form will include atension device that coiiperates with the spindles when they are indelivery position. While this tension device may ary in construction, inthe particular machine shown it includes a siaft 24-, this shaft beingprovided with a grooved drum Cooperating with the drum are blocks 26,these blocks being pivoted on arms 27, in turn pivoted to a cross bar523. This cross bar is mounted on rods 29 which slide in bearings 30 ona lracket 31, this bracket being also, in the particular ma 'hine shown,provided with a hearing which supports the tension drum shaft Thebracket 31 may be formed on or secured to a standard 33 secured. to til.frame.

Suitable means, which n vary in (onstruetion, may be provided, when atension device including a tension shaft is employed, to couple theshaft to the spindles. In the particular machine shown, the drum shaft 21: and. the spindles are provided with interlocking collars ill, 35 (see1, at. and The collar 35 is secured to the shaft by means of a. featheras so as to slide thereon in order to effect the interlocking. Toprevent these collars from becoming se 'iarated, there may be employed acatch pivoted at 38 in a cavity in the collar Elle, this catch beingthrown into locking position by a plate spring and engaging with ahooked piece 4-0 secured to the collar 1" headed operating pin it may beprovided to disenthe catch from the hook.

in the constructions embodying the invention, means will be provided foradjusting the offset spindles endwise, particularly when in deliveryposition, so that the. web may run truly to the printing), couple. llhile this adjusting mechanism when employed may he variouslyconstructed, the ad justment may be well etl'ected by means of thetension mechanism just referred to.

In the particular machine shown. the cross bar 28 is engagedby a screw4-2 which may, as shown, be provided with a hand wheel 1:9. By turningthis screw the bars 29 and the drum shaft may be caused to slide throughthe bearings and 32. When the drum shaft is locked to one of thespindles it is apparent that the spindle will move with the drum shaft.To prevent the collar 35 from being pulled off the shaft by thisadjusting); movement it may be provided with a. set screw, as 44, thisscrew being arranged to engage in a groove 45 in the shaft 94: so thatthe collar may have the sliding moven'ient before referred to to engageand disengage it from its companion collar, but will not e shaft whenthe spindle is adjusted. Each of the spindles may be provided withcollars, as 46, secured to the spindles in any suitable manner, as byscrews -l-7, which may be loosened to permit the adjustment referred toand afterward tightened to take the strain off the tension mechanism,these collars being arranged to lie close to the bearings which supportthe spindles.

The tension may be varied in any suit able manner, as for instance byproviding the levers 27 with threaded sockets 48 which are engaged by ascrew 49, this screw being in turn provided with an operating hand wheel50. It is apparent that as the web is wound upon the spindle when it isin receiving position the spindle will travel up. When the rewindingoperation is completed, however, the spindle will not be clear of thecradle rolls, when the same are employed, and it may not be in properposition to engage with the tension shaft. Further when a roll is emptyit will be in a position considerably above its cradle rolls, when thisform of driving mechanism is employed. In the particular machineillustrated, mechanism is provided for positioning the rolls to thespindles with respect to their driving mechanism, and also wit-h respectto the tension device shaft. While these means may vary, in theparticular machine illustrated, the bearings 51 of the spindle 5 arearranged to slide vertically on guides 52 mounted on the turn table andthese bearings have secured to them racks 53 which are engaged bypinions 5%. These pinions are driven through intermediates 55, 56 bygears 57 mounted on a shaft 58 extending across the machine. It will beunderstood that this shaft is provided with two of these driving gears57 and the bearings for the spindles at each end of the machine areprovided with racks and cooperating pinions. The shaft 58 may beprovided with a square end on which a handle 59 may be placed foroperating the shaft.

It will be understood that in the machine illustrated the spindle 6 isprovided with similar positioning racks, these racks being marked 60.The operating shaft for these racks is below the shaft 58 and is marked61. The mechanism intermediate the rack 61 is a duplicate of thatalready described and further description of it is unnecessary. To lockthe operating shafts 58 and 61 in position, each of these shafts may beprovided with a ratchet wheel 62 arranged to be engaged by a pawl 63.Any suitable web guiding mechanism may be employed. As shown, the turntable is provided with two guide rolls Get, and the bed of the machineis also provided with a suitable web tension roll as 65, this roll beingcontrolled by the usual spring rod construction 66.

The operation of the construction will be readily understood from theforegoing description taken in connection with the drawings. lVhen theoffset web has been wound off from the filled spindle and rewound on theother spindle the turn table is given a one-half turn which brings thefilled spindle into delivery position. The web is now led from this rollbetween the members of the printing couple, the turning of the spindlesend for end by the turn table serving to cause the web when thus ledbetween the members of the printing couple to be so presented to thecouple that the side which was originally next the impression memberwill be now next it. The driving mechanism for the empty spindle is thenconnected up with the driver and the tension mechanism is connected tothe filled spindle, the positioning device being operated to bring thespindles into their proper positions.

Changes and variations may be made in the constructions by which theinvention is carried into effect. The invention is not, therefore, to belimited to the construction hereinbefore described and illustrated.

What is claimed is 1. The combination with a printing couple, of a pairof spindles from one of which an offset web may be unwound and upon theother of which it may be wound, means for transposing the position ofthe spindles to bring them successively into de livery and receivingpositions and turning them end for end, and suitable offset web guidesfor leading the web between the members of the couple.

2. The combination with a pair of spindles either of which may be movedinto receiving or delivery position, a friction driving mechanism foreach spindle, a driver, and means for moving the spindles and drivingmechanisms to cause each of the driving mechanisms to cooperate with thedriver.

3. The combination with a pair of spindles either of which may be movedinto receiving and delivery positions, of a friction driving mechanismfor each spindle said mechanism including one or more friction drivingrolls, and a driver with which the 1 driving mechanism cooperates whenits roll is in receiving position.

at. The combination with a printing couple, of a pair of spindles eachof which may be brought into receiving and delivery position, of meanswith which each spindle may be caused to cooperate for adjusting itendwise.

5. The combination with a pair of offset web spindles, of means forsuccessively bringing the spindles into receiving and cleliveryposition, a driver with which the spindles cooperate when in receivingposi tion, a tension device including a shaft with which the spindlescooperate when in de livery position, means for coupling the spindies tothe tension device shaft, and means for adjusting the tension deviceshaft and the spindle coupled thereto endwise.

t3. the combination with a pair of horizontally arranged offset webspindles, of a horizontally arranged turn table on which the spindlesare mounted and which may be swung to bring each spindle into receivingand delivery position, means including a driver stationary with. respectto the turn table for driving the spindle when in receivin g position, atension device with which the spindle cooperates when in deliveryposition, and means for coupling the tension device to the s iindles.

'i'. The combination with a pair of offset web spindles, of means torshifting the position of the spindles to bring each of them intoreceiving and delivery position, driving mechanism for the spindles whenin receiving positioi'i, and means independent of the shifting means forbringi g the spindles into cooperative relation with the drivinglllttcllflllltilll.

8. The combination with pair of offset web spindles, of means forshifting the spindles to bring each of them into receiving and deliveryposition, a driving mechanism for the spindles when in receivingposition, a tension device for the spindles when in delivery position,and means independent of the shifting means for bringing the spindlesinto cooperative relation with respect to the driving mechanism and thetension device.

9. The combination with a Jair of offset web spindles, of drivingmechanism therefor including cradle rolls, means for shifting theposition of the spindles to bring each of them into receiving anddelivery position said shifting means turning the spindles end for end,and positioning means for the spindles.

10. The combination with a pair of ofi'set web spindles, of drivingmechanism therefor including cradle rolls, turn table upon which saidspindles and rolls are mounted said turn table serving to bring each ofthe rolls into receiving and delivery positions.

11. The combination with a pair of offset web spindles, of drivingmechanism for each of the spindles, said mechanism including cradlerolls, hearings in which the rolls are mounted, guides for the bearings,and means for moving the bearings along the guides.

12. The combination with a pair of oli'set web spindles, a drivingmechanism therefor including cradle rolls, a turn table on which therolls and spindles are mounted, a tension device including the shaftwith which each spindle co'ciperates when moved by the turn table intodelivery position, bearings for the spindles, guides for the bearings,means including suitable gearing for moving the bearings along theguides to bring the spindles into operative relation with the tensiondevice and the rolls, and coupling means for securing the spindles tothe tension device shaft.

13. The combination with a pair of olfset 70 web spindles, a drivingmechanism therefor including cradle rolls, a turn table on which therolls and spindles are mounted, a ten sion device including a shaft withwhich each spindle cooperates when moved by the 7 turn table intodelivery position, bearings for the spindles, guides for the bearings,means including suitable gearing for moving the bearings along theguides to bring the spindles into operative relation with the tensiondevice and the rolls, coupling means for securing the spindles to thetension device shaft, and means for moving the ten sion device shaft andspindle endwise.

In testimony whereof, I have hereunto set my hand, in the presence oftwo subscribing witnesses.

OSCAR ROESEN.

Witness-es JEROME ULLMAN, RICHARD KELLY.

flopies of this patent may be obtained for five cents each, byaddressing the Commissioner of ?atents, Washington, I). G.

